143H and 163H Motor Graders All Wheel Drive Caterpillar


All Wheel Drive System

Usage:

143H APN

Problem

One all wheel drive piston motor turns in the wrong direction.

Probable Cause

  • The locator pin in the distributor has been improperly positioned in the all wheel drive piston motor.

  • The hoses may be crossed between the control valve for the all wheel drive and the all wheel drive piston motor.

Problem

Both all wheel drive piston motors turn in the wrong direction.

Probable Cause

  • The locator pins in the distributor have been improperly positioned in the all wheel drive piston motors.

  • The hoses may be crossed on both sides between the control valve for the all wheel drive and the all wheel drive piston motor.

  • The hoses may be crossed between the all wheel drive piston pump and the flushing and cooling control valve.

  • The hoses may be crossed between the flushing and cooling control valve and the control valve for the all wheel drive.

Problem

The all wheel drive piston motor clacks during a sharp turn.

Probable Cause

  • The orifice plug in the control valve for the all wheel drive is missing.

  • There may be blockage in the case drain line from the all wheel drive piston motors.

  • The hydraulic oil pressure to the all wheel drive piston motors may be too low.

Problem

Only one all wheel drive piston motor turns when both all wheel drive piston motors should turn.

Probable Cause

  • The flow divider and combiner valve will not function correctly at low speed and at low pressure.

  • The seal between the distribution valve internal block and the distribution valve external block is blown out.

  • The orifice plug in the control valve for the all wheel drive is missing.

Problem

The seals in the wheel drives leak or the outer cover fails.

Probable Cause

  • An incorrect charge in the all wheel drive accumulator results in pressure spikes that are too high in the case drain lines of the all wheel drive piston motor.

  • Case drain lines for the all wheel drive piston motors may be blocked.

  • Improper assembly of the Duo-cone seal.

  • Wheel bearings are loose.

  • The hydraulic oil does not conform to the proper oil recommendation for the ambient operating temperature.

Problem

One all wheel drive motor or both all wheel drive motors click in fourth gear or in seventh gear.

Probable Cause

  • The cam ring is incorrectly oriented relative to the cover for the all wheel drive piston motor.

  • The displacement signal is not getting to the all wheel drive piston motor.

  • One all wheel drive piston motor or both of the all wheel drive piston motors have a failed displacement spool.

  • The all wheel drive electronic control module has failed.

Problem

When the machine is moving, the all wheel drive piston motors clack too much during engagement.

Probable Cause

  • The all wheel drive gear pump has failed.

  • The orientation of the solenoid valves is not correct.

  • The wiring to the solenoid valves in the control valve for the all wheel drive system is not correct.

  • The control valve for the all wheel drive system has failed.

Problem

When the machine is moving, the all wheel drive piston motors clack too much during disengagement.

Probable Cause

  • When the drive spool is shifted to the freewheel position, the all wheel drive solenoid in the control valve for the all wheel drive is deactivated.

  • The control valve for the all wheel drive has failed.

Problem

The all wheel drive piston motors growl in low speed.

Probable Cause

  • The front wheel bearings have not been preloaded.

Problem

The control valve for the all wheel drive makes a noise at high system pressures.

Probable Causes

  • The crossover relief valve is not set correctly.

  • The all wheel drive pressure sensor has failed.

Problem

The torque control lever has no effect on the pressure from the all wheel drive piston pump in forward speed or in reverse speed.

Probable Cause

  • The torque control lever is not sending the correct signal to the all wheel drive electronic control module.

  • The all wheel drive piston pump has failed.

  • The all wheel drive pressure sensor has failed.

  • The crossover relief valve has failed.

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